Add fixed raster scale use counter histograms.

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index f41bc9fea43e116e44e5cb744e9d05c65199a90c..8f6f658d76e6f9e165b70b617f310b9f683e5eb1 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -246,7 +246,9 @@ LayerTreeHost::LayerTreeHost(InitParams* params, CompositorMode mode)
       task_graph_runner_(params->task_graph_runner),
       image_serialization_processor_(params->image_serialization_processor),
       surface_id_namespace_(0u),
-      next_surface_sequence_(1u) {
+      next_surface_sequence_(1u),
+      has_fixed_raster_scale_blurry_content_(false),
+      has_fixed_raster_scale_potential_performance_regression_(false) {
   DCHECK(task_graph_runner_);
 
   animation_host_ = AnimationHost::Create(ThreadInstance::MAIN);
@@ -546,6 +548,11 @@ void LayerTreeHost::FinishCommitOnImplThread(LayerTreeHostImpl* host_impl) {
   else
     property_trees_.ResetAllChangeTracking(
         PropertyTrees::ResetFlags::TRANSFORM_TREE);
+
+  has_fixed_raster_scale_blurry_content_ =

[danakj, 2016/05/10 22:05:30]

What happened to sending them in begin main frame?

[vmpstr, 2016/05/13 00:13:34]

Leftover code from the previous patch. Removed.

+      host_impl->has_fixed_raster_scale_blurry_content();
+  has_fixed_raster_scale_potential_performance_regression_ =
+      host_impl->HasFixedRasterScalePotentialPerformanceRegression();
 }
 
 void LayerTreeHost::WillCommit() {
@@ -958,6 +965,14 @@ void LayerTreeHost::BuildPropertyTreesForTesting() {
       gfx::Rect(device_viewport_size_), identity_transform, &property_trees_);
 }
 
+void LayerTreeHost::ReportFixedRasterScaleUseCounters(
+    bool has_fixed_raster_scale_blurry_content,
+    bool has_fixed_raster_scale_potential_performance_regression) {
+  client_->ReportFixedRasterScaleUseCounters(
+      has_fixed_raster_scale_blurry_content_,

[danakj, 2016/05/10 22:05:30]

whats going on here? receive vars as args, but use members of LTH instead?

[vmpstr, 2016/05/13 00:13:34]

Fixed.

+      has_fixed_raster_scale_potential_performance_regression_);
+}
+
 bool LayerTreeHost::UsingSharedMemoryResources() {
   return GetRendererCapabilities().using_shared_memory_resources;
 }